more

1 files changed, 487 insertions, 0 deletions

diff --git a/src/grp-initprogs/systemd-fsck/fsck.c b/src/grp-initprogs/systemd-fsck/fsck.c
new file mode 100644
index 0000000000..4ca018763f
--- /dev/null
+++ b/src/grp-initprogs/systemd-fsck/fsck.c
@@ -0,0 +1,487 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+  Copyright 2014 Holger Hans Peter Freyther
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <sys/file.h>
+#include <sys/prctl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <systemd/sd-bus.h>
+
+#include "basic/alloc-util.h"
+#include "basic/fd-util.h"
+#include "basic/fs-util.h"
+#include "basic/parse-util.h"
+#include "basic/path-util.h"
+#include "basic/proc-cmdline.h"
+#include "basic/process-util.h"
+#include "basic/signal-util.h"
+#include "basic/socket-util.h"
+#include "basic/special.h"
+#include "basic/stdio-util.h"
+#include "basic/util.h"
+#include "sd-bus/bus-common-errors.h"
+#include "sd-bus/bus-error.h"
+#include "sd-device/device-util.h"
+#include "sd-device/sd-device.h"
+#include "shared/bus-util.h"
+
+/* exit codes as defined in fsck(8) */
+enum {
+        FSCK_SUCCESS = 0,
+        FSCK_ERROR_CORRECTED = 1,
+        FSCK_SYSTEM_SHOULD_REBOOT = 2,
+        FSCK_ERRORS_LEFT_UNCORRECTED = 4,
+        FSCK_OPERATIONAL_ERROR = 8,
+        FSCK_USAGE_OR_SYNTAX_ERROR = 16,
+        FSCK_USER_CANCELLED = 32,
+        FSCK_SHARED_LIB_ERROR = 128,
+};
+
+static bool arg_skip = false;
+static bool arg_force = false;
+static bool arg_show_progress = false;
+static const char *arg_repair = "-a";
+
+static void start_target(const char *target, const char *mode) {
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        int r;
+
+        assert(target);
+
+        r = bus_connect_system_systemd(&bus);
+        if (r < 0) {
+                log_error_errno(r, "Failed to get D-Bus connection: %m");
+                return;
+        }
+
+        log_info("Running request %s/start/replace", target);
+
+        /* Start these units only if we can replace base.target with it */
+        r = sd_bus_call_method(bus,
+                               "org.freedesktop.systemd1",
+                               "/org/freedesktop/systemd1",
+                               "org.freedesktop.systemd1.Manager",
+                               "StartUnitReplace",
+                               &error,
+                               NULL,
+                               "sss", "basic.target", target, mode);
+
+        /* Don't print a warning if we aren't called during startup */
+        if (r < 0 && !sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_JOB))
+                log_error("Failed to start unit: %s", bus_error_message(&error, r));
+}
+
+static int parse_proc_cmdline_item(const char *key, const char *value) {
+        int r;
+
+        assert(key);
+
+        if (streq(key, "fsck.mode") && value) {
+
+                if (streq(value, "auto"))
+                        arg_force = arg_skip = false;
+                else if (streq(value, "force"))
+                        arg_force = true;
+                else if (streq(value, "skip"))
+                        arg_skip = true;
+                else
+                        log_warning("Invalid fsck.mode= parameter '%s'. Ignoring.", value);
+
+        } else if (streq(key, "fsck.repair") && value) {
+
+                if (streq(value, "preen"))
+                        arg_repair = "-a";
+                else {
+                        r = parse_boolean(value);
+                        if (r > 0)
+                                arg_repair = "-y";
+                        else if (r == 0)
+                                arg_repair = "-n";
+                        else
+                                log_warning("Invalid fsck.repair= parameter '%s'. Ignoring.", value);
+                }
+        }
+
+#ifdef HAVE_SYSV_COMPAT
+        else if (streq(key, "fastboot") && !value) {
+                log_warning("Please pass 'fsck.mode=skip' rather than 'fastboot' on the kernel command line.");
+                arg_skip = true;
+
+        } else if (streq(key, "forcefsck") && !value) {
+                log_warning("Please pass 'fsck.mode=force' rather than 'forcefsck' on the kernel command line.");
+                arg_force = true;
+        }
+#endif
+
+        return 0;
+}
+
+static void test_files(void) {
+
+#ifdef HAVE_SYSV_COMPAT
+        if (access("/fastboot", F_OK) >= 0) {
+                log_error("Please pass 'fsck.mode=skip' on the kernel command line rather than creating /fastboot on the root file system.");
+                arg_skip = true;
+        }
+
+        if (access("/forcefsck", F_OK) >= 0) {
+                log_error("Please pass 'fsck.mode=force' on the kernel command line rather than creating /forcefsck on the root file system.");
+                arg_force = true;
+        }
+#endif
+
+        arg_show_progress = access("/run/systemd/show-status", F_OK) >= 0;
+}
+
+static double percent(int pass, unsigned long cur, unsigned long max) {
+        /* Values stolen from e2fsck */
+
+        static const int pass_table[] = {
+                0, 70, 90, 92, 95, 100
+        };
+
+        if (pass <= 0)
+                return 0.0;
+
+        if ((unsigned) pass >= ELEMENTSOF(pass_table) || max == 0)
+                return 100.0;
+
+        return (double) pass_table[pass-1] +
+                ((double) pass_table[pass] - (double) pass_table[pass-1]) *
+                (double) cur / (double) max;
+}
+
+static int process_progress(int fd) {
+        _cleanup_fclose_ FILE *console = NULL, *f = NULL;
+        usec_t last = 0;
+        bool locked = false;
+        int clear = 0, r;
+
+        /* No progress pipe to process? Then we are a NOP. */
+        if (fd < 0)
+                return 0;
+
+        f = fdopen(fd, "re");
+        if (!f) {
+                safe_close(fd);
+                return -errno;
+        }
+
+        console = fopen("/dev/console", "we");
+        if (!console)
+                return -ENOMEM;
+
+        for (;;) {
+                int pass, m;
+                unsigned long cur, max;
+                _cleanup_free_ char *device = NULL;
+                double p;
+                usec_t t;
+
+                if (fscanf(f, "%i %lu %lu %ms", &pass, &cur, &max, &device) != 4) {
+
+                        if (ferror(f))
+                                r = log_warning_errno(errno, "Failed to read from progress pipe: %m");
+                        else if (feof(f))
+                                r = 0;
+                        else {
+                                log_warning("Failed to parse progress pipe data");
+                                r = -EBADMSG;
+                        }
+                        break;
+                }
+
+                /* Only show one progress counter at max */
+                if (!locked) {
+                        if (flock(fileno(console), LOCK_EX|LOCK_NB) < 0)
+                                continue;
+
+                        locked = true;
+                }
+
+                /* Only update once every 50ms */
+                t = now(CLOCK_MONOTONIC);
+                if (last + 50 * USEC_PER_MSEC > t)
+                        continue;
+
+                last = t;
+
+                p = percent(pass, cur, max);
+                fprintf(console, "\r%s: fsck %3.1f%% complete...\r%n", device, p, &m);
+                fflush(console);
+
+                if (m > clear)
+                        clear = m;
+        }
+
+        if (clear > 0) {
+                unsigned j;
+
+                fputc('\r', console);
+                for (j = 0; j < (unsigned) clear; j++)
+                        fputc(' ', console);
+                fputc('\r', console);
+                fflush(console);
+        }
+
+        return r;
+}
+
+static int fsck_progress_socket(void) {
+        static const union sockaddr_union sa = {
+                .un.sun_family = AF_UNIX,
+                .un.sun_path = "/run/systemd/fsck.progress",
+        };
+
+        int fd, r;
+
+        fd = socket(AF_UNIX, SOCK_STREAM, 0);
+        if (fd < 0)
+                return log_warning_errno(errno, "socket(): %m");
+
+        if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) {
+                r = log_full_errno(errno == ECONNREFUSED || errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
+                                   errno, "Failed to connect to progress socket %s, ignoring: %m", sa.un.sun_path);
+                safe_close(fd);
+                return r;
+        }
+
+        return fd;
+}
+
+int main(int argc, char *argv[]) {
+        _cleanup_close_pair_ int progress_pipe[2] = { -1, -1 };
+        _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
+        const char *device, *type;
+        bool root_directory;
+        siginfo_t status;
+        struct stat st;
+        int r;
+        pid_t pid;
+
+        if (argc > 2) {
+                log_error("This program expects one or no arguments.");
+                return EXIT_FAILURE;
+        }
+
+        log_set_target(LOG_TARGET_AUTO);
+        log_parse_environment();
+        log_open();
+
+        umask(0022);
+
+        r = parse_proc_cmdline(parse_proc_cmdline_item);
+        if (r < 0)
+                log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
+
+        test_files();
+
+        if (!arg_force && arg_skip) {
+                r = 0;
+                goto finish;
+        }
+
+        if (argc > 1) {
+                device = argv[1];
+
+                if (stat(device, &st) < 0) {
+                        r = log_error_errno(errno, "Failed to stat %s: %m", device);
+                        goto finish;
+                }
+
+                if (!S_ISBLK(st.st_mode)) {
+                        log_error("%s is not a block device.", device);
+                        r = -EINVAL;
+                        goto finish;
+                }
+
+                r = sd_device_new_from_devnum(&dev, 'b', st.st_rdev);
+                if (r < 0) {
+                        log_error_errno(r, "Failed to detect device %s: %m", device);
+                        goto finish;
+                }
+
+                root_directory = false;
+        } else {
+                struct timespec times[2];
+
+                /* Find root device */
+
+                if (stat("/", &st) < 0) {
+                        r = log_error_errno(errno, "Failed to stat() the root directory: %m");
+                        goto finish;
+                }
+
+                /* Virtual root devices don't need an fsck */
+                if (major(st.st_dev) == 0) {
+                        log_debug("Root directory is virtual or btrfs, skipping check.");
+                        r = 0;
+                        goto finish;
+                }
+
+                /* check if we are already writable */
+                times[0] = st.st_atim;
+                times[1] = st.st_mtim;
+
+                if (utimensat(AT_FDCWD, "/", times, 0) == 0) {
+                        log_info("Root directory is writable, skipping check.");
+                        r = 0;
+                        goto finish;
+                }
+
+                r = sd_device_new_from_devnum(&dev, 'b', st.st_dev);
+                if (r < 0) {
+                        log_error_errno(r, "Failed to detect root device: %m");
+                        goto finish;
+                }
+
+                r = sd_device_get_devname(dev, &device);
+                if (r < 0) {
+                        log_error_errno(r, "Failed to detect device node of root directory: %m");
+                        goto finish;
+                }
+
+                root_directory = true;
+        }
+
+        r = sd_device_get_property_value(dev, "ID_FS_TYPE", &type);
+        if (r >= 0) {
+                r = fsck_exists(type);
+                if (r < 0)
+                        log_warning_errno(r, "Couldn't detect if fsck.%s may be used for %s, proceeding: %m", type, device);
+                else if (r == 0) {
+                        log_info("fsck.%s doesn't exist, not checking file system on %s.", type, device);
+                        goto finish;
+                }
+        }
+
+        if (arg_show_progress) {
+                if (pipe(progress_pipe) < 0) {
+                        r = log_error_errno(errno, "pipe(): %m");
+                        goto finish;
+                }
+        }
+
+        pid = fork();
+        if (pid < 0) {
+                r = log_error_errno(errno, "fork(): %m");
+                goto finish;
+        }
+        if (pid == 0) {
+                char dash_c[sizeof("-C")-1 + DECIMAL_STR_MAX(int) + 1];
+                int progress_socket = -1;
+                const char *cmdline[9];
+                int i = 0;
+
+                /* Child */
+
+                (void) reset_all_signal_handlers();
+                (void) reset_signal_mask();
+                assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
+
+                /* Close the reading side of the progress pipe */
+                progress_pipe[0] = safe_close(progress_pipe[0]);
+
+                /* Try to connect to a progress management daemon, if there is one */
+                progress_socket = fsck_progress_socket();
+                if (progress_socket >= 0) {
+                        /* If this worked we close the progress pipe early, and just use the socket */
+                        progress_pipe[1] = safe_close(progress_pipe[1]);
+                        xsprintf(dash_c, "-C%i", progress_socket);
+                } else if (progress_pipe[1] >= 0) {
+                        /* Otherwise if we have the progress pipe to our own local handle, we use it */
+                        xsprintf(dash_c, "-C%i", progress_pipe[1]);
+                } else
+                        dash_c[0] = 0;
+
+                cmdline[i++] = "/sbin/fsck";
+                cmdline[i++] =  arg_repair;
+                cmdline[i++] = "-T";
+
+                /*
+                 * Since util-linux v2.25 fsck uses /run/fsck/<diskname>.lock files.
+                 * The previous versions use flock for the device and conflict with
+                 * udevd, see https://bugs.freedesktop.org/show_bug.cgi?id=79576#c5
+                 */
+                cmdline[i++] = "-l";
+
+                if (!root_directory)
+                        cmdline[i++] = "-M";
+
+                if (arg_force)
+                        cmdline[i++] = "-f";
+
+                if (!isempty(dash_c))
+                        cmdline[i++] = dash_c;
+
+                cmdline[i++] = device;
+                cmdline[i++] = NULL;
+
+                execv(cmdline[0], (char**) cmdline);
+                _exit(FSCK_OPERATIONAL_ERROR);
+        }
+
+        progress_pipe[1] = safe_close(progress_pipe[1]);
+        (void) process_progress(progress_pipe[0]);
+        progress_pipe[0] = -1;
+
+        r = wait_for_terminate(pid, &status);
+        if (r < 0) {
+                log_error_errno(r, "waitid(): %m");
+                goto finish;
+        }
+
+        if (status.si_code != CLD_EXITED || (status.si_status & ~1)) {
+
+                if (status.si_code == CLD_KILLED || status.si_code == CLD_DUMPED)
+                        log_error("fsck terminated by signal %s.", signal_to_string(status.si_status));
+                else if (status.si_code == CLD_EXITED)
+                        log_error("fsck failed with error code %i.", status.si_status);
+                else
+                        log_error("fsck failed due to unknown reason.");
+
+                r = -EINVAL;
+
+                if (status.si_code == CLD_EXITED && (status.si_status & FSCK_SYSTEM_SHOULD_REBOOT) && root_directory)
+                        /* System should be rebooted. */
+                        start_target(SPECIAL_REBOOT_TARGET, "replace-irreversibly");
+                else if (status.si_code == CLD_EXITED && (status.si_status & (FSCK_SYSTEM_SHOULD_REBOOT | FSCK_ERRORS_LEFT_UNCORRECTED)))
+                        /* Some other problem */
+                        start_target(SPECIAL_EMERGENCY_TARGET, "replace");
+                else {
+                        log_warning("Ignoring error.");
+                        r = 0;
+                }
+
+        } else
+                r = 0;
+
+        if (status.si_code == CLD_EXITED && (status.si_status & FSCK_ERROR_CORRECTED))
+                (void) touch("/run/systemd/quotacheck");
+
+finish:
+        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}